US3588446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically heated bedcover and power modulating control circuits therefor
Assignee: FIELD CREST CANNON Inc
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Filing: 1969-03-03
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Granted: 1971-06-28
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Expires: 1989-03-03
Abstract
Abstract AN ELECTRICALLY HEATED BEDCOVER SUCH AS A BLANKET WHEREIN THE AVERAGE POWER DELIVERED TO A HEATING CIRCUIT INCLUDING AN ELECTRICAL HEATING ELEMENT IN THE BLANKET IS MODULATED IN RESPONSE TO LOW CURRENT LEVEL GATING SIGNALS APPLIED TO A GATE CONTROL ELEMENT OF A SEMICONDUCTOR SWITCHING MEANS BY VARYING THE CONDUCTION ANGLE THEREOF, AND WHEREIN THE GATING SIGNALS ARE APPLIED BY A GATING SIGNAL MEANS INCLUDING AT LEAST ONE POSITIVE TEMPERATURE COEFFICIENT RESISTANCE DEVICE RESPONSIVE TO A TEMPERATURE INDICATIVE OF THE COMFORT OF A USER OF THE BLANKET FOR VARYING THE RESISTANCE OF THE GATING CIRCUIT.
Inventors
- 👤 Edwin R Mills
- 👤 Ernest L Elmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:32
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/1906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |